• 한국지반공학회논문집
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• 제30권7호
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• pp.55-61
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• 2014

최근 들어 경제적이고 친환경적인 에너지 활용을 위하여 지열에너지 필요성이 증대되고 있다. 수평형 지중 열교환기는 설치 비용이 저렴하여 비용 대비 효율면에서 우수하다. 수평형 지중 열교환기의 타입에는 여러 가지가 있으나 이 중 슬링키형과 코일형이 우수한 것으로 알려져 있다. 따라서 본 논문에서는 $5m{\times}1m{\times}1m$ 크기의 모형 토조내에 수평 슬링키형과 코일형 지중 열교환기를 각각 설치한 후 열교환율을 실험적으로 측정하였다. 모형 토조 내에는 건조 상태의 주문진 모래가 조성되었으며 수평 슬링키형과 코일형의 피치 간격에 따라 열교환율을 측정하기 위해 30시간 동안 연속으로 열응답 시험을 실시하였다. 실험 결과 코일형 지중 열교환기 이용시 수평 슬링키형 보다 약 30, 40% 정도의 높은 파이프 단위 길이당 열교환율을 보였다. 또한 수평 슬링키형과 코일형 이용시 피치 간격이 넓을 때(피치/직경 = 1)가 좁을 때(피치/직경 = 0.2)보다 약 200, 250% 정도의 높은 파이프 단위 길이당 열교환율을 나타냈다.

• 설비공학논문집
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• 제24권3호
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• pp.230-239
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• 2012

Ground-coupled heat pump (GCHP) systems utilize the immense renewable storage capacity of the ground as a heat source or sink to provide space heating, cooling, and domestic hot water. The main objective of the present study is to investigate the cooling and heating performance of a small scale GCHP system with horizontal ground heat exchanger (HGHE). In order to evaluate the performance, a water-to-air ground-source heat pump unit connected to a test room with a net floor area of 18.4 m2 and a volume of 64.4 m3 in the Korea Institute of Construction Technology ($37^{\circ}39'N$, $126^{\circ}48'E$) was designed and constructed. This GCHP system mainly consisted of slinky-type HGHE with a total length of 400 m, indoor heat pump, and measuring devices. The peak cooling and heating loads of the test room were 5.07 kW and 4.12 kW, respectively. The experimental results were obtained from March 15, 2011 to August 31, 2011 and the performance coefficients of the system were determined from the measured data. The overall seasonal performance factor (SPF) for cooling was 3.31 while the system delivered heating at a daily average performance coefficients of 2.82.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2007년도 춘계학술대회
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• pp.470-473
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• 2007

Geothermal heat exchanger(GHEX) is a major component of Geothermal heat pump system(GSHPs). In Common, We use the vertical type GHEX in Korea. But vertical type GHEX needs a high cost for installation, because of drilling the hole which has 200m depth at max. So, We suggest the use of horizontal type GHEX. When we construct buildins, We excavate the ground and we can install the horizontal type GHEX at the excavated underground. It's very cheap and convenient method compare to vertical type GHEX installation. This study is peformed to estimate the peformance of horizontal type GHEX and to analyze effects of heat exchanger types and undergroundwater. As the result, slinky type GHEX has a 66% efficiency compare to vertical type GHEX and mat type has a 201% efficiency at the undergroundwater zone.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2005년도 춘계학술대회
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• pp.684-687
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• 2005

Ground source heat pump systems are used for heating, ventilating and air-conditioning systems in commercial buildings, schools, and factories because of low operating and maintenance costs. These systems use the earth as a heat source in heating mode and a heat sink in cooling mode. Ground heat exchangers are classified by a horizontal type and vertical type according to the installation method. A horizontal type means that a heat exchanger is laid in the trench bored in 1.2 to 1.8 m depth. The solar heat and the rainwater are affected by the performance of heat exchanger and causes mutual influence among heat exchangers. In this study, to evaluate the performance of straight type, slinky type, and spiral type of horizontal ground heat exchangers designed on 1 RT scale, test sections are buried on the earth and experimental apparatus is installed. Therefore the performance of these is estimated.